Nortel Meridian Companion PCI User Manual page 60

Display screens 55
The level of voice impurity increases with greater distance between
the portable and the radio and higher radio traffic. Impure voice
samples are categorized by level of severity as Type 1 or Type 2.
These categories are described as follows:
Type 1 Samples
The human ear is just capable of discerning the lower levels of a
Type 1 sample. User perception increases at the upper levels of a
Type 1 sample and may be manifested as clicks, pops or muted
intervals.
Type 1 Samples contain at least one instance of a detected CRC
Packet Error Rate greater than 1.3 per second and less than or equal
to 3.6 per second. This sample of digitally encoded voice is taken
from a 15 second interval and corresponds to an average bit error
rate greater than two in 1000 bits and less than or equal to seven in
1000 bits.
Type 2 Samples
Type 2 samples are readily perceived by the user and may be heard
as hissing or garbled speech in addition to the Type 1 sample
manifestations.
Type 2 Samples contain at least one instance of a detected CRC
Packet Error Rate greater than 3.6 per second. This sample of
digitally encoded voice is taken from a 15 second interval and
corresponds to an average bit error rate greater than seven in 1000
bits.
Voice Impurity
Voice Impurity is a percentage calculated for each radio by adding
the radio's Type 1 and Type 2 samples and dividing by the number
of voice samples collected over the selected time interval.
The dialogue window gives the number of system voice samples
taken and the number of radios with voice impurity levels greater
than 5% over the selected time interval.
Contents of the displayed screen may be filed in REPORT.TXT and
R_RESULT.LOG by pressing F4. A standard text editor (e.g., edit
on DOS 5.0) can be used to view this stored data.
P0886303 Issue 01 Standard Companion Diagnostic Software for PCI User Guide